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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2014
Jul. 31, 2013
Operating Loss Carryforwards [Line Items]        
Income tax expense $ 28.2 $ 25.9 $ 64.2 $ 58.7
Effective tax rate 75.20% 35.20%    
Discrete income tax expense (benefit) 3.5      
Net decrease in unrecognized tax benefits for the next 12 months, Minimum 0   0  
Net decrease in unrecognized tax benefits for the next 12 months, Maximum 18   18  
Increase In Valuation Allowances [Member]
        
Operating Loss Carryforwards [Line Items]        
Discrete income tax expense (benefit)     7.0  
Return To Provision Adjustments [Member]
        
Operating Loss Carryforwards [Line Items]        
Discrete income tax expense (benefit)     $ (3.0)